Support setting cache-control of object

[jaspercs2]

No description provided.

[jaspercs2]

Hi, @fsouza , The simulator is very cool!
I use it in local unit testing. There is a scenario where I will set cache-control of object and need to get and check it. Currently, the simulator does not support it, so this PR supports setting cache-control. Please help review it when you are free, and if there is any problem with it, feel free to ping me, thank you!

[fsouza]

Looks good in general. Please update the .gitignore file and I can merge it! 😁

Also, do you not want to set the Cache-Control header in the download object response? (

fake-gcs-server/fakestorage/object.go

Lines 885 to 899 in 5c38ffa

	} else {
	if obj.ContentType != "" {
	w.Header().Set(contentTypeHeader, obj.ContentType)
	}
	// If content was transcoded, the underlying encoding was removed so we shouldn't report it.
	if obj.ContentEncoding != "" && !transcoded {
	w.Header().Set("Content-Encoding", obj.ContentEncoding)
	}
	// X-Goog-Stored-Content-Encoding must be set to the original encoding,
	// defaulting to "identity" if no encoding was set.
	storedContentEncoding := "identity"
	if obj.ContentEncoding != "" {
	storedContentEncoding = obj.ContentEncoding
	}
	w.Header().Set("X-Goog-Stored-Content-Encoding", storedContentEncoding)

)